DISTRICTS
(alphabetical) 		CONTAINING COUNTIES
BATHURST Created in 1822 from Eastern District, abolished in 1849 Lanark 1824-1849
Carleton (transferred from Johnstown District) 1822-1838 (transferred to Dalhousie District)
Renfrew 1845-1849
BROCK Created in 1839 from London District, abolished in 1849 Oxford (transferred from London District) 1839-1849

COLBORNE Created in 1841 from Newcastle District, abolished in 1849

 Peterborough (transferred from Newcastle District) 1841-1849

DALHOUSIE Created in 1842, from Bathurst District, abolished in 1849

 Carleton (transferred from Bathurst District) 1842-1849

EASTERN Created in 1788 as Lunenburg District, renamed in 1792, abolished in 1849

 Dundas 1792-1849
Glengarry 1798-1849
Grenville 1792-1800 (transferred to Johnstown District)
Leeds 1792-1800 (transferred to Johnstown District)
Ontario (comprised of the Islands in the St. Lawrence River) 1792-1800 (abolished)
Prescott 1800-1816 (transferred to Ottawa District)
Russell 1800-1816 (transferred to Ottawa District)
Stormont 1792-1849

GORE Created in 1816 from Home and Niagara Districts, abolished in 1849

Halton 1816-1849
Wentworth 1816-1849

HOME Created in 1788 as Nassau District, renamed in 1792, abolished in 1849

 Durham 1792-1802 (transferred to Newcastle District)
Lincoln 1792-1798 (transferred to Niagara District)
Norfolk [part] 1792-1798 (transferred to London District)
Northumberland 1792-1802 (transferred to Newcastle District)
Simcoe 1821-1843 (transferred to Simcoe District)
York 1792-1849

HURON Created in 1841 from London District, abolished in 1849

 Huron (transferred from London District) 1841-1849

JOHNSTOWN Created in 1800 from Eastern District, abolished in 1849

 Leeds (transferred from Eastern District) 1800-1849
Grenville (transferred from Eastern District) 1800-1849
Carleton 1800-1822 (transferred to Bathurst District)

LONDON Created in 1800 from Home and Western Districts, abolished in 1849

 Middlesex 1800-1849
Huron 1835-1841
Norfolk (transferred from Western District) 1800-1837 (transferred to Talbot District)
Oxford 1800-1839 (transferred to Brock District)

MIDLAND Created in 1788 as Mecklenburg District, renamed in 1792, abolished in 1849

 Frontenac 1792-1849
Addington 1792-1849 (merged with Lennox County in 1800)
Lennox 1792-1849 (merged with Addington County in 1800)
Hastings 1792-1839 (transferred to Victoria District)
Prince Edward 1792-1831 (transferred to Prince Edward District)

NEWCASTLE Created in 1802 from Home District, abolished in 1849

 Durham (transferred from Home District) 1802-1849
Northumberland (transferred from Home District) 1802-1849
Peterborough 1878-1841 (transferred to Colborne District)

NIAGARA Created in 1800 from Home District, abolished in 1849

 Haldimand 1800-1849
Lincoln (transferred from Home District) 1800-1849
Welland (created from Lincoln County) 1845-1849

OTTAWA Created in 1816 from Eastern District, abolished in 1849

 Russell (transferred from Eastern District) 1816-1849
Prescott (transferred from Eastern District) 1816-1849

PRINCE EDWARD

Created in 1834 from Midland District, abolished in 1849

 Prince Edward (transferred from Midland District) 1834-1849

SIMCOE Created in 1843 from Home District, abolished in 1849

 Simcoe (transferred from Home District) 1843-1849

TALBOT Created in 1837 from London District, abolished in 1849

 Norfolk (transferred from London District) 1837-1849

VICTORIA Created in 1839 from Midland District, abolished in 1849

 Hastings (transferred from Midland District) 1839-1849

WELLINGTON

Created in 1840 from Gore, Simcoe, and Huron Districts, abolished in 1849

 Waterloo 1840-1849

WESTERN Created in 1788 as Hesse District, renamed in 1792, abolished in 1849

 Essex 1792-1849
Kent 1792-1849
Norfolk [part] 1792-1798 (transferred to London District)
COUNTIES
(alphabetical) 		WITHIN WHICH DISTRICTS
Addington Created in 1792 (merged with Lennox County in 1800) Midland 1792-1800
Bruce Created in 1850 (no corresponding district)
Carleton Created in 1800 from Dundas and Grenville Counties

Johnstown 1800-1822
Bathurst 1822-1838
Dalhousie 1838-1849
Dufferin Created in 1874 from Grey, Simcoe and Wellington Counties) (no corresponding district)
Dundas Created in 1792

Eastern 1792-1849
Durham Created in 1792

Home 1792-1802
Newcastle 1802-1849
Elgin Created in 1851 from Middlesex County

(no corresponding district)
Essex Created in 1792

Western 1792-1849
Frontenac Created in 1792

Midland 1792-1849
Glengarry Created in 1792

Eastern 1792-1849
Grenville Created in 1792 Eastern 1792-1800
Johnstown 1800-1849
Grey Created in 1851 from Simcoe County
(no corresponding district)
Haldimand Created in 1800 from Norfolk

Niagara 1800-1849
Haliburton Created in 1874

(no corresponding district)
Halton Created in 1816 from York County (West Riding)

Gore 1816-1849
Hastings Created in 1792

Midland 1792-1839
Victoria 1839-1849
Huron Created in 1835 from London District

London 1835-1841
Huron 1841-1849
Kent Created in 1792

Western 1792-1849
Lambton Created in 1850 from Kent County

(no corresponding district)
Lanark Created in 1824 from Leeds County

Bathurst 1824-1849
Leeds Created in 1792 Eastern 1792-1800
Johnstown 1800 -1849
Lennox Created in 1792 (merged with Addington County in 1800)

Midland 1792-1800
Lincoln Created from 1792

Home 1792-1800
Niagara 1800-1849
Middlesex Created in 1800

London 1800-1849
Norfolk Created in 1792

Home [part] and Western [part] 1792-1800 
London 1800-1837
Talbot 1837-1849
Northumberland Created in 1792

Home 1792-1802
Newcastle 1802-1849

Ontario (comprised of the islands in the St. Lawrence River) Created in 1792 (abolished in 1800)

Midland 1792-1800
Ontario Created in 1851 from York County (East Riding)

(no corresponding district)
Oxford Created in 1800 London 1800-1839
Brock 1839-1849
Peel Created in 1851 from York County (East Riding)

(no corresponding district)
Perth Created in 1849

Huron 1849
Peterborough Created in 1838 from Durham and Northumberland Counties

Newcastle 1838-1841
Colborne 1841-1849
Prescott Created in 1800 from Glengarry County Eastern  1800-1816
Ottawa 1816-1849
Prince Edward Created in 1792 Midland 1792-1834
Prince Edward 1834-1849
Renfrew Created in 1845 from Lanark County

Bathurst 1845-1849
Russell Created in 1800 from Stormont County

Eastern 1800-1816
Ottawa 1816-1849
Simcoe Created in 1792 Home 1821-1843
Simcoe 1843-1849
Stormont Created in1792

Eastern 1792-1849 
Victoria Created in 1851 from Peterborough County

(no corresponding district)
Waterloo Created in 1840 from Halton, Huron and Simcoe Counties

Wellington 1840-1849
Welland Created in 1845 from Lincoln County

Niagara 1845-1849
Wellington Created in 1851 from Waterloo County

(no corresponding district)
Wentworth Created in 1816 from Haldimand, Lincoln and York (West Riding) Counties

Gore 1816-1849
York Created in 1792

Home 1792-1849